Wireless Door Chime, Door Open Sensor Alarm When Entry Business/Office/Store (500ft Range 51 Ringer Adjustable Volume) Home Alert Bell for Kid/Toddler Safety,1 Receiver +4 Sensors

500 Ft Working Range: When a door or window is opened, the buzzer will instantly play the ringing alarm of your choice. Up to 500 feet of wireless connectivity in open areas, ideal for home front door, office or store.Not suitable for metal doors
Easy Installation: The receiver is plug-and-play with no wiring required! Easily mount the sensor with screws or double-sided tape. Secure the sensor by attaching double sided tape to the sensor and placing it on the door/window. Great for business entrances, office entrances, or store fronts!
5 Levels of Volume: Adjustable loudness (1-5 levels of volume). Maximum 110DB, suitable for noisy stores, classrooms; support switching mute mode, can be muted in the conference room or sleep.